The Ratings are in
For the Fall of 1945
I thought maybe the big numbers for KTRH and KXYZ in the mornings reflected, respectively, Arthur Godfrey, who had just gone national in April of 1945, and Don McNeill's Breakfast Club, which had been national (although maybe not in Houston all the time) since 1933. However, when I looked at the radio listings in my files closest to this date, in the Spring of 1947, I found the Breakfast Club on KXYZ at 9 am but Arthur Godfrey was on KTRH at 2 pm (30 minutes, with House Party - Art Linkletter? - at 3pm).
I have no idea what was responsible for the big numbers on KPRC in the afternoon.
I'm grateful to Chris Huff of the DFW Radio Archives for sharing this graphic.